We have passed ISO9001: 2008 , also we have passed CE, CCC, FCC, ROHS, CE-LVD and so on. 2)We are a factory which was established in 1995. 3)We can design the amplifier and speaker by our clients (OEM). 4)fast delivery and excellent after-sale service5)We have five rich-experienced engineers.if you need any accoustic suggestion for your sound system project,just feels free to contact me.